Sorghum (Jowar) Cultivation: Important Facts & One-Liners 🌾
Welcome to our comprehensive study notes on Sorghum (Jowar) Cultivation. Whether you are preparing for ICAR JRF, AFO, CUET-PG, or your semester exams, these fast-paced, one-liner facts cover everything you need to know about this major cereal crop!
📌 1. General Introduction & Botany
- Botanical Name: Sorghum bicolor.
- Family: Poaceae (also known as Gramineae), which is the standard family for cereal crops.
- Chromosome Number: 2n = 20.
- Origin: Africa.
- Nutritional Value: Contains around 10% to 12% protein and up to 70% carbohydrates.
- Plant Type: It is a C4 plant and a self-pollinated crop.
- Inflorescence & Fruit: The inflorescence of sorghum is known as a panicle (or head), and its fruit type is a caryopsis.
- The "Camel Crop": Sorghum is highly drought-resistant and can survive extreme hardship without water, which is why it is famously called the "Camel Crop" of the plant world.
☠️ 2. Sorghum Toxicity: The HCN (Prussic Acid) Factor
One of the most frequently asked topics in exams is the toxicity found in sorghum plants.
- The Toxin: Sorghum tissues (roots, stems, leaves) contain a cyanoglycoside commonly known as Dhurrin.
- How it is produced: Dhurrin is produced when the plant faces mechanical damage, severe drought conditions, or freezing temperatures.
- Formation of HCN: Under these stress conditions, the cyanoglycoside loses its glucose, resulting in the formation of Hydrogen Cyanide (HCN), which is also called Prussic Acid.
- Where is it found? The HCN is actually produced in the roots of the plant, but it is transferred to and accumulates primarily in the leaves.
- Toxicity Level: HCN is highly toxic to livestock, and its toxic limit is 200 ppm.
- Precaution: You should never feed sorghum to cattle in its early stages because the HCN concentration is highest in young leaves.
- Human Safety: Sorghum grains do not contain any HCN, making them perfectly safe for human consumption.
🌱 3. Important Varieties
- CSH-1: This is the first sorghum hybrid, developed in the year 1964.
- CSV-15: A highly popular dual-purpose variety (used for both grain and fodder).
- Pusa Chari: A famous multi-cut fodder variety, allowing for multiple fodder harvests.
- Combine Kafir 60: A very popular male-sterile variety widely used in commercial hybrid seed production.
- There are also specific varieties developed to be highly tolerant to both drought and soil salinity.
🌦️ 4. Climate and Soil Requirements
- Soil: The best soils for sorghum cultivation are clay loam or black cotton soil, though it can adapt to various soil types. A fine seedbed is essential due to the small size of the seeds.
- Sowing Method: In heavy soils (like black or clay soil), the ridge and furrow method is considered the best for sowing.
- Temperature: The optimum growth temperature is between 26°C to 30°C. However, being highly drought-tolerant, sorghum can withstand extreme temperatures up to 45°C to 46°C where other crops would fail.
- Salinity: Most sorghum varieties show good resistance to soil salinity.
📏 5. Agronomy: Seed Rate, Spacing & Fertilizers
- Seed Rate (Grain): 12 to 15 kg per hectare.
- Seed Rate (Fodder): 40 to 45 kg per hectare.
- Sowing Depth: Because the seeds are small, they should be sown at a shallow depth of 3 to 4 cm.
- Spacing: Keep row-to-row distance at 45 cm and plant-to-plant distance at 10 to 12 cm.
- Plant Population: Approximately 1.5 lakh plants per hectare is considered optimum for grain purposes.
- Fertilizer Requirement (NPK):
- For Grain: 80-100 : 40 : 40 kg/ha.
- For Fodder: 100-120 : 40 : 40 kg/ha (Nitrogen is increased for better vegetative growth).
💧 6. Water Management
Sorghum is primarily a rainfed crop, but if irrigation is available, it should be applied during these three critical stages to maximize yield:
- Germination Stage
- Booting Stage
- Flowering Stage (Note: Avoid excessive irrigation as it can lead to lodging.).
🌿 7. Weed Management
- Critical Weed-Free Period: The first 15 to 45 Days After Sowing (DAS).
- Chemical Control: The herbicide Atrazine is considered the best for weed control.
- Major Parasitic Weed: Striga, which is a partial root parasite, is the most important and damaging weed for sorghum.
🐛 8. Important Insect Pests
Make sure to memorize the scientific names of these crucial pests:
- Sorghum Shoot Fly: Atherigona soccata.
- Stem Borer: Chilo partellus.
- Pink Stem Borer: Sesamia inferens.
- Head Bug: Calocoris angustatus.
🦠 9. Major Diseases
Sorghum is heavily affected by different types of smuts. Pay close attention to their causal organisms:
- Head Smut: Sphacelotheca reiliana.
- Covered Kernel Smut: Sphacelotheca sorghi.
- Loose Smut: Sphacelotheca cruenta.
- Long Smut: Tolyposporium ehrenbergii.
- Downy Mildew: Peronosclerospora sorghi.
- Rust: Puccinia purpurea.
🌾 10. Harvesting
Sorghum is a relatively short-duration crop and is usually ready for harvesting within 100 to 115 days.
